Butterfly Menagerie

an improved circle of death, this circle is a 20ft sphere though smaller than a normal circle of death it does 8d8 necrotic damage and 8d8 Radiant damage both negates necrotic and radiant immunities to creatures you choose in the radius on a failed Dexterity Save as spectral butterflies appear from you and and fly to your enemies passing through them infecting them with shadowy necrotic energy and vibrant energy of color. After the initial impact the circle remains for 10 minutes as the spectral butterflies of a variety of color swarm around the area, giving you and your allies advantage on rolls and an extra 1d4 radiant or necrotic damage on weapon strikes.